.spinner
  margin 100px auto
  width 50px
  height 50px
  text-align center
  font-size 10px
  div
    display inline-block
    width 5px
    height 100%
    background-color rgb(43, 128, 226)
    margin-right 1px
    animation bytedance 1s infinite
    for num in (2..5)
        &:nth-child({num})
            animation-delay (-0.9+(num - 2)*0.1)s
@keyframes bytedance
  0%, 40%, 100%
    transform scaleY(0.4)
  20% 
    transform scaleY(1)
